US20060207057A1 - Damping device for pieces of furniture with improved compensation system of volume variations - Google Patents
Damping device for pieces of furniture with improved compensation system of volume variations Download PDFInfo
- Publication number
- US20060207057A1 US20060207057A1 US11/374,088 US37408806A US2006207057A1 US 20060207057 A1 US20060207057 A1 US 20060207057A1 US 37408806 A US37408806 A US 37408806A US 2006207057 A1 US2006207057 A1 US 2006207057A1
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- United States
- Prior art keywords
- damping device
- inner chamber
- stem
- piston
- cavity
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- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/064—Units characterised by the location or shape of the expansion chamber
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F5/00—Braking devices, e.g. checks; Stops; Buffers
- E05F5/02—Braking devices, e.g. checks; Stops; Buffers specially for preventing the slamming of swinging wings during final closing movement, e.g. jamb stops
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F5/00—Braking devices, e.g. checks; Stops; Buffers
- E05F5/06—Buffers or stops limiting opening of swinging wings, e.g. floor or wall stops
- E05F5/10—Buffers or stops limiting opening of swinging wings, e.g. floor or wall stops with piston brakes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/3405—Throttling passages in or on piston body, e.g. slots
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05Y2201/00—Constructional elements; Accessories therefore
- E05Y2201/20—Brakes; Disengaging means, e.g. clutches; Holders, e.g. locks; Stops; Accessories therefore
- E05Y2201/21—Brakes
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05Y2201/00—Constructional elements; Accessories therefore
- E05Y2201/20—Brakes; Disengaging means, e.g. clutches; Holders, e.g. locks; Stops; Accessories therefore
- E05Y2201/252—Brakes; Disengaging means, e.g. clutches; Holders, e.g. locks; Stops; Accessories therefore characterised by type of friction
- E05Y2201/254—Fluid or viscous friction
- E05Y2201/256—Fluid or viscous friction with pistons or vanes
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05Y2201/00—Constructional elements; Accessories therefore
- E05Y2201/20—Brakes; Disengaging means, e.g. clutches; Holders, e.g. locks; Stops; Accessories therefore
- E05Y2201/262—Brakes; Disengaging means, e.g. clutches; Holders, e.g. locks; Stops; Accessories therefore characterised by type of motion
- E05Y2201/264—Brakes; Disengaging means, e.g. clutches; Holders, e.g. locks; Stops; Accessories therefore characterised by type of motion linear
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/20—Application of doors, windows, wings or fittings thereof for furnitures, e.g. cabinets
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
- Air Bags (AREA)
Abstract
A damping device (100), in particular for damping impacts of mobile parts in pieces of furniture, comprises: a casing (1) wherein is defined an inner chamber containing a viscous fluid and substantially closed at one end through a cap (2); a piston (3) slidably mounted in the inner chamber; a stem (4) having a first end (4 a) associated with the piston (3) and a second end (4 b) projecting from the inner chamber. The damping device (100) is characterised in that the cap (2) comprises at least one floating gasket (28) slidably mounted in a cavity (24) defined in the cap (2), said floating gasket (28) defining a region with variable volume in the cavity (24) suitable for receiving the viscous fluid displaced into the inner chamber by the stem (4) during the movements of the piston (3).
The cavity (24) defined in the cap (2) and the floating gasket (28) slidably mounted in it define a system for compensating the variation in volume available in the inner chamber to receive the viscous fluid, due to the insertion/removal of the stem (4).
Description
- The present invention refers to a damping device, in particular to a damping device for damping impacts of mobile parts in pieces of furniture.
- The invention also refers to a piece of furniture comprising such a damping device.
- In the field of pieces of furniture of various types and for different uses comprising mobile parts, such as, for example, sliding doors or drawers, it is known to use damping devices to dampen impacts of such mobile parts when they come into abutment with the fixed structure of the respective piece of furniture. The occurrence of impacts, as well as being unpleasant for users, can indeed in the long term compromise the functionality of the pieces of furniture.
- A type of damping device commonly used for the aforementioned purposes is represented by linear hydraulic dampers, essentially consisting of a piston slidably mounted inside a casing defining an inner chamber containing a viscous fluid, responsible for the damping effect. The piston defines two-regions with variable volume in the inner chamber: when the force of an impact discharges on a stem associated with the piston, the viscous fluid is forced to pass from a first region where the pressure increases to a second low-pressure region where the fluid is collected. When the thrust exerted on the stem ceases, a spring resets the piston and the stem and the fluid is taken back into the first region, so that the damper is ready for another working cycle.
- Although damping devices of this type are known also in other technical fields, the versions used in the furniture industry must satisfy specific operating requirements, as well as strict demands of cost-effectiveness and compactness that are essential in this field, determining the special structural and functional characteristics thereof.
- In particular, in damping devices for pieces of furniture of the type described above there is the requirement that the volume of the inner chamber be completely filled by the viscous fluid to avoid noises during operation and to optimise the damping action. While satisfying this requirement it shall be considered that, when the stem is inserted into the inner chamber due to an impact, the volume available to the viscous fluid in the inner chamber decreases due to the bulk of the stem itself, and then increase again when the stem comes out during the reset stroke. Therefore, damping devices have been developed which are equipped with a system for compensating the volume of the viscous fluid displaced by the stem during the movements of the piston. Generally, such damping devices comprise a suitable cavity of variable volume in fluid communication with the inner chamber, which substantially acts as a lung for the volume variation occurring within the inner chamber when the stem is inserted/withdrawn.
- In known damping devices, the volume variation within the cavity of the volume compensation system is usually achieved by placing inside the cavity a spongy body with closed alveoli containing a compressible fluid, typically air, which can be squeezed, increasing the volume of the cavity, under the thrusting effect of the viscous fluid.
- Damping devices for pieces of furniture equipped with a volume compensation system of the type described above are for example disclosed in documents US 2003/0075845 A1 and US 2002/0010977 A1.
- Such damping devices, although substantially suitable for satisfying the above-mentioned requirement, do have some drawbacks.
- A first drawback is connected to the overpressure (compared to atmospheric pressure) arising in the inner chamber upon compression of the spongy body for compensating the volume of viscous fluid displaced by the insertion of the stem in the inner chamber. Such an overpressure determines an undesired additional thrust on the stem and on the piston, which tends to push the stem out from the inner chamber and could therefore prevent a mobile part from correctly closing in abutment against the damping device.
- A second drawback is connected to the presence of a compressible fluid, such as air, inside the alveoli of the spongy body. The breaking of one or more alveoli, e. g. by wear, can compromise the correct operation of the damping device due to the formation of dispersions of compressible fluid in the viscous fluid.
- The purpose of the present invention is to provide a damping device that is able to overcome the drawbacks of the prior art and that is also constructively simpler and more compact.
- According to a first aspect thereof, the present invention therefore concerns a damping device, in particular for damping impacts of mobile parts in pieces of furniture, comprising:
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- a casing wherein an inner chamber is defined containing a viscous fluid and substantially closed at one end through a cap;
- a piston slidably mounted in the inner chamber;
- a stem having a first end associated with the piston and a second end projecting from the inner chamber, characterised in that said cap comprises at least one floating gasket slidably mounted in a cavity defined in the cap, said floating gasket defining in said cavity a region with variable volume suitable for receiving the viscous fluid displaced in said inner chamber from said stem during the movements of said piston.
- The cavity defined in the cap and the floating gasket slidably mounted therein define a system for compensating the variation of the volume available in the inner chamber for receiving the viscous fluid, hereafter defined as “useful volume”, said variation being due to the insertion/removal of the stem. The compensation takes place effectively thanks to the sliding capability of the floating gasket inside the cavity defined in the cap, said sliding being controlled by the viscous fluid that flows from the inner chamber of the damping device into such a cavity and vice-versa.
- During the working stroke of the piston, i.e. the stroke in which the damping of the impact takes place, the useful volume of the inner chamber of the damping device decreases due to the insertion of the stem and the viscous fluid consequently displaced flows into the cavity defined in the cap. This makes the floating gasket slide so as to increase the volume of the region with variable volume defined by the floating gasket in the aforementioned cavity. During the subsequent reset stroke of the piston, i.e. the stroke in which the piston and the stem are taken back into their initial position to carry out another working cycle, the stem comes out from the inner chamber of the damping device with an increase in the useful volume, that can once again be filled by the viscous fluid previously temporarily accumulated in the region with variable volume, defined by the floating gasket. During the flowing of the viscous fluid from the cavity defined in the cap towards the inner chamber of the damping device a sliding of the floating gasket is also caused in the opposite direction to the previous one and such as to decrease the volume of the region with variable volume.
- Advantageously, the volume compensation system described above avoids the use of compressible bodies, such as spongy bodies incorporating air, to carry out the volume compensation. The damping device of the invention thus allows the drawbacks described above with reference to the damping devices of the prior art to be substantially eliminated and has, compared to them, a simpler overall structure, with consequent lower manufacturing costs.
- A further structural simplification of the damping device of the invention is due to the advantageous possibility of using the floating gasket both for volume compensation and as a sealing element, for which reason it is not necessary to provide further gaskets at the cap to ensure the seal of the inner chamber.
- Moreover, the volume compensation system is advantageously defined inside the cap, so as to substantially limit the overall dimensions of the damping device of the invention.
- Preferred characteristics of the damping device according to the invention are defined in the attached claims 2-9, the content of which is here fully incorporated as a reference.
- According to a second aspect thereof, the present invention refers to a piece of furniture comprising a damping device of the aforementioned type.
- Of course, the advantageous characteristics outlined above with reference to the damping device of the present invention define as many advantageous characteristics of the piece of furniture in which the damping device can be mounted, said piece of furniture therefore being structurally and functionally simpler and less expensive.
- Further characteristics and advantages of the invention shall become clearer from the following description of some preferred embodiments thereof, made hereafter, for indicating and not limiting purposes, with reference to the attached drawings. In such drawings:
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FIG. 1 is an exploded perspective view of a damping device according to the invention; -
FIG. 2 is a side view of a casing of the damping device ofFIG. 1 ; -
FIG. 3 is a longitudinal section view taken along the line A-A of the casing ofFIG. 2 ; -
FIG. 4 is a side view of a cap of the damping device ofFIG. 1 ; -
FIGS. 4 a, 4 b are respectively a front and a rear view of the cap ofFIG. 4 ; -
FIG. 5 is a longitudinal section view taken along the line B-B of the cap ofFIG. 4 ; -
FIG. 6 is a side view of a piston of the damping device ofFIG. 1 ; -
FIGS. 6 a, 6 b are respectively a front and a rear view of the piston ofFIG. 6 ; -
FIG. 7 is a longitudinal section view taken along the line C-C of the piston ofFIG. 6 ; -
FIG. 8 is a side view of the piston ofFIG. 6 operatively associated with a floating shutter in a first operating position; -
FIG. 8 a is a longitudinal section view taken along the line D-D of the piston ofFIG. 8 ; -
FIG. 9 is a side view of the piston ofFIG. 6 operatively associated with a floating shutter in a second operating position; -
FIG. 9 a is a longitudinal section view taken along the line E-E of the piston ofFIG. 9 ; -
FIG. 10 is a side view of the damping device ofFIG. 1 in a first operating configuration; -
FIG. 10 a is a longitudinal section view taken along the line F-F of the damping device ofFIG. 10 ; -
FIG. 11 is a side view of the damping device ofFIG. 1 in a second operating configuration; -
FIG. 11 a is a longitudinal section view taken along the line G-G of the damping device ofFIG. 11 . - In such figures, a damping device according to the invention is wholly indicated with
reference numeral 100. - The damping device 100 (
FIG. 1 ) essentially comprises acasing 1 in which aninner chamber 12 is defined, acap 2 that substantially closes theinner chamber 12 making a seal with the inner surface of thecasing 1, apiston 3 slidably mounted inside theinner chamber 12, astem 4 associated with thepiston 3 and a resettingelement 6. - The casing 1 (
FIGS. 2 and 3 ) is preferably cylindrical and has a firstlongitudinal end 1 a closed and a secondlongitudinal end 1 b open to allow the insertion of thepiston 3 and of other components inside thecasing 1 itself. After the assembly of such components, thecap 2 is applied at thelongitudinal end 1 b. Inside thecasing 1 at thelongitudinal end 1 a aboss 11 is formed defining an abutment for thepiston 3. - The
inner chamber 12 defined by thecasing 1 has a volume V suitable for receiving the aforementioned components and containing a viscous fluid responsible for the damping action. Such a viscous fluid is preferably a silicon-based fluid, of the type commonly known to those skilled in the art and available on the market. - The
piston 3 is slidably mounted in theinner chamber 12 and defines inside it two regions Z1, Z2 with variable volume in fluid communication with each other at at least oneduct 31 defined in thepiston 3 and at anhollow space 32 defined between the outer surface of thepiston 3 and the inner surface of thecasing 1. - A floating
shutter 5, preferably spherical in shape, is operatively associated with thepiston 3 to close theduct 31 during the working stroke of thepiston 3 and to open theduct 31 during the reset stroke of thepiston 3. - The piston 3 (
FIGS. 6, 6 a, 6 b, 7) essentially comprises acentral body 33 and aseat 34 for the floatingshutter 5, preferably at least partially defined byprojections 35 projecting axially from thecentral body 33. In theseat 34 the floatingshutter 5 is free to move between a first operating position in which it opens the duct 31 (FIGS. 8, 8 a and 10 a) and a second operating position in which it closes the duct 31 (FIGS. 9, 9 a and 11 a), according to the motion of thepiston 3 in theinner chamber 12. - Preferably, the
central body 33 comprises afirst portion 33 a having a large cross section and asecond portion 33 b, extending axially from thefirst portion 33 a on the opposite side to theseat 34. Thesecond portion 33 b defines with the inner surface of thecasing 1 at least one receivingregion 38 of the viscous fluid in fluid communication with theduct 31. Thefirst portion 33 a is preferably substantially cylindrical and thesecond portion 33 b is preferably substantially prismatic, even more preferably parallelepiped or cubic. Thesecond portion 33 b preferably comprises at least two diametricallyopposite edges 36 extending radially beyond thefirst portion 33 a. Thecorners 36, preferably chamfered, are suitable for cooperating with the inner wall of thecasing 1 to guide the stroke of thepiston 3. - At the
second portion 33 b a dead hole is also defined in an axial position for receiving thefirst end 4 a of thestem 4, for example through force fitting. Asecond end 4 b of the stem axially projects from theinner chamber 12 at thecap 2 in the rest configuration of the damping device 100 (FIGS. 10, 10 a). Preferably, thesecond end 4 b of thestem 4 is associated with apush rod 41, which is preferably equipped with anabutment element 42 made from rubber to muffle the noise of the impacts. - Preferably, the
duct 31 defined in thepiston 3 comprises at least one substantiallyaxial portion 31 a at thefirst portion 33 a of thecentral body 33 and at least one substantiallyradial portion 31 b at thesecond portion 33 b of thecentral body 33. In the case where thesecond portion 33 b is prismatic, the at least one substantiallyradial portion 31 b of theduct 31 extends substantially perpendicular to a side face of thesecond portion 33 b of thecentral body 33. - In the preferred embodiment illustrated here (see in particular
FIGS. 7, 8 a, 9 a), the substantiallyradial portion 31 b of theduct 31 extends between two diametrically opposite side faces of theportion 33 b of thecentral body 33 and is in fluid communication with two receivingregions 38 of the viscous fluid, which are defined at opposite sides of theportion 33 b between the aforementioned side faces and the inner surface of thecasing 1. Theduct 31 therefore defines through the piston 3 a substantially T-shaped path for the viscous fluid. - The cap 2 (
FIGS. 4, 4 a, 4 b and 5) preferably consists of a hollow body that is substantially cylindrical, or in any case has cross section and external dimensions such as to allow it to be mounted coaxially inside thecasing 1 at theend 1 b for at least a portion of thecap 2 and, preferably, for the entire longitudinal extension thereof, as illustrated inFIGS. 10 a and 11 a. - According to the invention, the
cap 2 comprises at least one floatinggasket 28 slidably mounted in acavity 24 defined in thecap 2. The floatinggasket 28 defines a region with variable volume Z3 in thecavity 24 suitable for reversibly receiving the viscous fluid displaced in theinner chamber 12 by thestem 4 during movements of thepiston 3. - Preferably, the
cap 2 also comprises an annular partition 26 (visible inFIGS. 1, 10 a and 11 a) suitable for axially dividing thecavity 24 from theinner chamber 12. The presence of theannular partition 26 is advantageous to define an abutment for the floatinggasket 28. - Preferably, the
cavity 24 is in fluid communication with theinner chamber 12 at a hole 27 defined in theannular partition 26 and provided for allowing the slidable coupling with thestem 4 with a predeterminedradial clearance 29. Advantageously, such aradial clearance 29 allows theinner chamber 12 to be placed in fluid communication with thecavity 24 in a simple and compact way. - Preferably, the
annular partition 26 is removably associated with thecap 2, so as to allow the floatinggasket 28 to be easily assembled in thecavity 24. - On the opposite side to the
annular partition 26 thecavity 24 is axially defined by atransverse wall 21 defined inside thecap 2 and having ahole 22, substantially coaxial with hole 27, for the passage of thestem 4, in this case with a minimal radial clearance due to just the dimensional tolerances. - The
cavity 24 and the floatinggasket 28 advantageously define a system for compensating the variation of the useful volume occurring in theinner chamber 12 due to the insertion/removal of thestem 4, as better illustrated hereafter with reference to the operation of the dampingdevice 100. - In the preferred embodiment of the invention illustrated here, the floating
gasket 28 is a double-seal gasket, also known to those skilled in the art with the term X-shaped gasket or sleeve gasket, arranged to provide a seal on the side walls of the cavity. 24 and on thestem 4. The possibility of making a seal also on thestem 4 through the floatinggasket 28, and therefore of substantially sealably insulating theinner chamber 12 and thecavity 24 towards the outside, advantageously allows the structure of the dampingdevice 100 to be simplified, since the use a further gasket arranged specifically for this purpose can be avoided. - The damping
device 100 is dimensioned so that the ratio of the cross section of thecavity 24 to the cross section of thestem 4 is preferably between about 5 and about 30, more preferably between about 10 and about 20. This allows the volume compensation to be achieved with minimal axial sliding of the floatinggasket 28 in thecavity 24, and therefore allows the axial extension of thecavity 24 and the overall dimensions of the dampingdevice 100 to be advantageously limited. - As illustrated in
FIG. 3 , thecap 2 also preferably comprises aseat 23 adapted to receive thepush rod 41 of thestem 4 substantially completely in the operative configuration in which thepiston 3 is at the end of its working stroke (FIGS. 11, 11 a). In order to avoid the accidental detachment of thepush rod 41 from thestem 4, at least onelongitudinal groove 25 having an axially outer end positioned a predetermined distance from the outer edge of thecavity 23 is preferably defined on the inner surface of thecavity 23, said groove being adapted to slidably receive at least oneprojection 43 extending laterally from thepush rod 41. - The damping
device 100 further comprises aconventional resetting element 6, for example a coil spring, suitable for providing the force required to reset thepiston 3 and thestem 4. In the preferred embodiment illustrated here, the resettingelement 6 is housed inside thecasing 1 and is operatively arranged between thelongitudinal end 1 a of thecasing 1 and thepiston 3. - Referring in particular to
FIGS. 10 a and 11 a the operation of the dampingdevice 100 shall now be described.FIG. 10 a shows the dampingdevice 100 in a first operating configuration at rest, when external forces do not act upon the device. In this operating configuration, the resettingelement 6 keeps thepiston 3 pressed against theannular partition 26 of thecap 2 and thepush rod 41 associated with thestem 4 projects from thecasing 1 in a state of maximum extension from therespective seat 23 defined in thecap 2. - Under an external force F, due for example to an impact against the
push rod 41 following the closing of a mobile part of a piece of furniture, thepiston 3 moves in the direction of the arrow A, carrying out the working stroke. The displacement of thepiston 3 determines in the inner chamber 12 a volume reduction of the region Z1 and a volume increase of the region Z2. The motion of thepiston 3 combined with the pressure increase in the region Z1 takes and keeps theshutter 5 in its second operative position, in which it closes theportion 31 a of theduct 31, preventing the passage of the viscous fluid. In this condition, the only passageway available to the viscous fluid towards the region Z2 consists of thehollow space 32, for which reason the resistance against the motion of thepiston 3 and the damping effect are at their maximum. - During the working stroke of the
piston 3, the useful volume available to the viscous fluid in theinner chamber 12 decreases due to the progressive insertion of thestem 4. Such a volume decrease is compensated by the volume increase of the region Z3 in thecavity 24 of thecap 2, made possible by the sliding of the floatinggasket 28 inside thecavity 24 caused by the push of the viscous fluid itself. The viscous fluid displaced by thestem 4 can flow from theinner chamber 12 into thecavity 24 thanks to theradial clearance 29 between the hole 27 of theannular partition 26 and thestem 4 slidably mounted through it. - The working stroke of the
piston 3 ends when the floatingshutter 5 comes into abutment against theboss 11 of thecasing 1 and thepush rod 42 is received substantially completely in theseat 23 of thecap 2. The dampingdevice 100 is thus in a second operating configuration, represented inFIG. 11 a, and remains in such a configuration until the external force F is applied, for example all the time the mobile part of a piece of furniture remains closed. - When the external force F is removed, the resetting
element 6, compressed during the working stroke, determines the reset stroke in which thepiston 3 moves in the direction of the arrow B. The displacement of thepiston 3 determines in the inner chamber 12 a volume reduction of the region Z2 and a volume increase of the region Z1. The motion of thepiston 3 combined with the pressure increase in the region Z2 causes theshutter 5 to move away from thepiston 3, and takes theshutter 5 into its first operating position, in which it opens theduct 31 in thepiston 3. In this condition the viscous fluid can flow from the region Z2 to the region Z1 both through thehollow space 32 and through theduct 31. The resistance against the motion of thepiston 3 and the required resetting force are thus substantially low. - During the reset stroke of the
piston 3, the useful volume available to the viscous fluid in theinner chamber 12 once again increases thanks to the progressive removal of thestem 4 and the viscous fluid previously temporarily received in thecavity 24 of thecap 2 can again flow into theinner chamber 12. This flow also makes the floatinggasket 28 slide towards theannular partition 26 with a consequent volume decrease of the region Z3. - The reset stroke ends when the
piston 3 comes into abutment against theannular partition 26 of thecap 2 and the dampingdevice 100 is again in the first operating configuration. - The damping
device 100 has a preferred although not exclusive use in pieces of furniture to dampen impacts of mobile parts coming into abutment with a fixed structure of the respective piece of furniture. Thus, the dampingdevice 100 can be installed inside a piece of furniture (not illustrated in the figures), comprising a fixed structure, to which thecasing 1 of the dampingdevice 100 is fixed, and a mobile part, for example a door or a sliding drawer, which during closing comes into abutment with the dampingdevice 100. - Obviously, those skilled in the art may introduce variants and modifications in the above described damping device, in order to satisfy specific and contingent requirements, which variants and modifications fall anyhow within the scope of protection as is defined by the appended claims.
Claims (11)
1. Damping device (100), in particular for damping impacts of mobile parts in pieces of furniture, comprising:
a casing(1) wherein an inner chamber (12) is defined containing a viscous fluid and substantially closed at one end through a cap (2);
a piston (3) slidably mounted in said inner chamber (12);
a stem (4) having a first end (4 a) associated with said piston (3) and a second end (4 b) projecting from said inner chamber (12), characterised in that said cap (2) comprises at least one floating gasket (28) slidably mounted in a cavity (24) defined in said cap (2), said floating gasket (28) defining in said cavity (24) a region (Z3) with variable volume suitable for receiving the viscous fluid displaced into said inner chamber (12) by said stem (4) during the movements of said piston (3).
2. Damping device (100) according to claim 1 , wherein said cap (2) comprises an annular partition (26) suitable for axially dividing said cavity (24) from said inner chamber (12).
3. Damping device (100) according to claim 2 , wherein said cavity (24) is in fluid communication with said inner chamber (12) at a hole (27) defined in said annular partition (26) and provided for allowing the slidable coupling with said stem (4) with a predetermined radial clearance.
4. Damping device (100) according to claim 2 , wherein said 30 annular partition (26) is removably associated with said cap (2).
5. Damping device (100) according to claim 1 , wherein said floating gasket (28) is a double-seal gasket arranged to provide a seal on said stem (4) and on the side walls of said cavity (24).
6. Damping device (100) according to claim 1 , wherein the ratio of the cross section of said cavity (24) to the cross section of said stem (4) is between about 5 and about 30.
7. Damping device (100) according to claim 6 , wherein the ratio of the cross section of said cavity (24) to the cross section of said stem (4) is between about 10 and about 20.
8. Damping device (100) according to claim 1 , wherein said cap (2) comprises a seat (23) adapted to receive substantially completely a push rod (41) associated with said second end (4 b) of the stem (4).
9. Damping device (100) according to claim 8 , wherein said seat (23) comprises at least one longitudinal groove (25) adapted to slidably receive at least one projection (43) laterally extending from said push rod (41).
10. Damping device (100) according to claim 1 , comprising a resetting element (6) suitable for providing a resetting force for said piston (3), said resetting element (6) being housed inside said inner chamber (12).
11. Piece of furniture comprising a damping device (100) according to claim 1.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2005A000419 | 2005-03-15 | ||
IT000419A ITMI20050419A1 (en) | 2005-03-15 | 2005-03-15 | SHOCK-ABSORBING DEVICE FOR FURNISHING ELEMENTS WITH A COMPENSATION SYSTEM OF THE IMPROVED VOLUME VARIATION |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060207057A1 true US20060207057A1 (en) | 2006-09-21 |
Family
ID=36581587
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/374,088 Abandoned US20060207057A1 (en) | 2005-03-15 | 2006-03-14 | Damping device for pieces of furniture with improved compensation system of volume variations |
Country Status (7)
Country | Link |
---|---|
US (1) | US20060207057A1 (en) |
EP (1) | EP1703060B1 (en) |
CN (1) | CN1862052A (en) |
AT (1) | ATE385276T1 (en) |
DE (1) | DE602006000493T2 (en) |
ES (1) | ES2301103T3 (en) |
IT (1) | ITMI20050419A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080295283A1 (en) * | 2007-06-04 | 2008-12-04 | Tom Tice | Soft close door closure device |
US20100212109A1 (en) * | 2007-06-12 | 2010-08-26 | Moonju Hardware Co., Ltd | Hinge damper |
US20110179599A1 (en) * | 2010-01-22 | 2011-07-28 | Flexngate Automotive Iberica, S.A. | Door retaining device |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010070624A1 (en) | 2008-12-19 | 2010-06-24 | Titus International Plc | Linear shock absorber with rotary shaft |
DE102010056036A1 (en) * | 2010-12-15 | 2012-06-21 | Wörner Automatisierungstechnik GmbH | Stop module for position-accurate holding of workpiece in clean room in field of e.g. food industry, has cylinder filled with fluid whose viscosity is variably adjustable, and brake element including actuator to change viscosity of fluid |
DE202012004636U1 (en) * | 2012-05-10 | 2013-08-12 | Intorq Gmbh & Co. Kg | Damper element and brake with damper elements |
DE102015200570B4 (en) * | 2015-01-15 | 2018-10-18 | Geze Gmbh | retraction device |
CN104976270A (en) * | 2015-07-10 | 2015-10-14 | 上海爱登堡电梯集团股份有限公司 | Sealing structure suitable for end cover of plunger barrel of hydraulic buffer |
DE102017102078A1 (en) * | 2017-02-02 | 2018-08-02 | Druck- und Spritzgußwerk Hettich GmbH & Co. KG | Brake device and furniture or household appliance with a braking device |
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-
2005
- 2005-03-15 IT IT000419A patent/ITMI20050419A1/en unknown
-
2006
- 2006-03-10 DE DE602006000493T patent/DE602006000493T2/en active Active
- 2006-03-10 AT AT06004928T patent/ATE385276T1/en not_active IP Right Cessation
- 2006-03-10 EP EP06004928A patent/EP1703060B1/en not_active Not-in-force
- 2006-03-10 ES ES06004928T patent/ES2301103T3/en active Active
- 2006-03-14 US US11/374,088 patent/US20060207057A1/en not_active Abandoned
- 2006-03-15 CN CN200610059143.5A patent/CN1862052A/en active Pending
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US3919509A (en) * | 1973-06-28 | 1975-11-11 | Stabilus Gmbh | Electrically conductive pneumatic spring with door actuated switch means |
US4071057A (en) * | 1975-07-21 | 1978-01-31 | Tokico Ltd. | Method for filling gas into sealed cylinder device |
US4108423A (en) * | 1976-07-19 | 1978-08-22 | Atwood Vacuum Machine Company | Gas spring |
US4298194A (en) * | 1980-04-07 | 1981-11-03 | Atwood Vacuum Machine Company | Gas spring with improved terminal connector and mounting means |
US4342447A (en) * | 1980-08-25 | 1982-08-03 | Atwood Vacuum Machine Company | Gas spring with tubular shell seal |
US4582303A (en) * | 1981-01-29 | 1986-04-15 | Tayco Developments, Inc. | Seal protecting construction for liquid spring |
US4548389A (en) * | 1983-03-01 | 1985-10-22 | Fichtel & Sachs Industries, Inc. | Redundant high-pressure seal for fluid spring |
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US6315093B1 (en) * | 1999-11-05 | 2001-11-13 | Kayaba Industry Co., Ltd. | Hydraulic shock absorber |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080295283A1 (en) * | 2007-06-04 | 2008-12-04 | Tom Tice | Soft close door closure device |
US20100212109A1 (en) * | 2007-06-12 | 2010-08-26 | Moonju Hardware Co., Ltd | Hinge damper |
US8336166B2 (en) * | 2007-06-12 | 2012-12-25 | Moonju Hardware Co., Ltd | Hinge damper |
US20110179599A1 (en) * | 2010-01-22 | 2011-07-28 | Flexngate Automotive Iberica, S.A. | Door retaining device |
US8424159B2 (en) * | 2010-01-22 | 2013-04-23 | Flexngate Automotive Iberica, S.A. | Door retaining device |
Also Published As
Publication number | Publication date |
---|---|
CN1862052A (en) | 2006-11-15 |
ES2301103T3 (en) | 2008-06-16 |
DE602006000493D1 (en) | 2008-03-20 |
EP1703060A1 (en) | 2006-09-20 |
ITMI20050419A1 (en) | 2006-09-16 |
EP1703060B1 (en) | 2008-01-30 |
ATE385276T1 (en) | 2008-02-15 |
DE602006000493T2 (en) | 2009-01-22 |
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Legal Events
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AS | Assignment |
Owner name: AGOSTINO FERRARI S.P.A., ITALY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MIGLI, CARLO;REEL/FRAME:017683/0687 Effective date: 20060526 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |